31621442 has 4 divisors (see below), whose sum is σ = 47432166. Its totient is φ = 15810720.

The previous prime is 31621441. The next prime is 31621477. The reversal of 31621442 is 24412613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25999801 + 5621641 = 5099^2 + 2371^2 .

It is not an unprimeable number, because it can be changed into a prime (31621441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7905359 + ... + 7905362.

Almost surely, 2^31621442 is an apocalyptic number.

31621442 is a deficient number, since it is larger than the sum of its proper divisors (15810724).

31621442 is a wasteful number, since it uses less digits than its factorization.

31621442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15810723.

The product of its digits is 1152, while the sum is 23.

The square root of 31621442 is about 5623.2945859167. The cubic root of 31621442 is about 316.2233172820.

The spelling of 31621442 in words is "thirty-one million, six hundred twenty-one thousand, four hundred forty-two".